#root {
  max-width: 600px;
  margin: 0 auto;
  padding: 45px 0 0 0;
  text-align: center;
  
 /* 为固定导航栏留出空间 */
}

.navbar-fixed {
  position: fixed;
  height: 45px;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: white;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  display: flex;
  justify-content: center;
  align-items: center;
}

.logo {
  height: 6em;
  padding: 1.5em;
  will-change: filter;
  transition: filter 300ms;
}
.logo:hover {
  filter: drop-shadow(0 0 2em #646cffaa);
}
.logo.react:hover {
  filter: drop-shadow(0 0 2em #61dafbaa);
}

@keyframes logo-spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@media (prefers-reduced-motion: no-preference) {
  a:nth-of-type(2) .logo {
    animation: logo-spin infinite 20s linear;
  }
}

.card {
  padding: 2em;
}

.read-the-docs {
  color: #888;
}



.container {
  display: flex;
  justify-content: space-around;
  background: #f0f0f0;
  flex-wrap: wrap;
  padding: 20px;
}
.item {
  cursor: pointer;
  flex:  0 0 100px;
  background: skyblue;
  margin: 10px;
  padding: 20px;
  &:hover {
    background: pink;
  }
}
